SO if i understand what you are trying to say correctly :

You made preset lists of sounds for Korg, Yamaha, ROland, Ketron sounds, and when you choose these sounds you mediastation sounds like one of them..

But you need to choose which preset list to use, so either you are sounding like a Korg or a Yamaha but never like a mix of them?

The style and solo voices sounded okay to my ears...